BGP / Routing Cheatsheet

Quick reference for BGP and routing commands covering BGP configuration, attributes, route-maps, prefix-lists, communities, troubleshooting, OSPF, and EIGRP

Related Categories:Network

69 commands

router bgp {ASN}

Start BGP process

router bgp 65001

neighbor {ip} remote-as {ASN}

Define BGP neighbor

neighbor 10.0.0.2 remote-as 65002

network {prefix} mask {mask}

Advertise network in BGP

network 192.168.1.0 mask 255.255.255.0

neighbor {ip} update-source {iface}

Set update source interface

neighbor 10.0.0.2 update-source Loopback0

neighbor {ip} ebgp-multihop {ttl}

Set eBGP multihop

neighbor 10.0.0.2 ebgp-multihop 2

neighbor {ip} next-hop-self

Set next-hop to self

neighbor 10.0.0.2 next-hop-self

neighbor {ip} password {key}

Set MD5 authentication for neighbor

neighbor 10.0.0.2 password SecretKey123

neighbor {ip} shutdown

Disable BGP neighbor

neighbor 10.0.0.2 shutdown

neighbor {ip} timers {keepalive} {hold}

Set BGP timers

neighbor 10.0.0.2 timers 10 30

bgp router-id {ip}

Set BGP router ID

bgp router-id 1.1.1.1

bgp log-neighbor-changes

Log neighbor state changes

bgp log-neighbor-changes

no synchronization

Disable IGP synchronization

no synchronization

neighbor {ip} weight {n}

Set Weight attribute (local preference)

neighbor 10.0.0.2 weight 200

bgp default local-preference {n}

Set default Local Preference

bgp default local-preference 200

set local-preference {n}

Set Local Preference in route-map

set local-preference 150

set as-path prepend {ASN}

Prepend ASN to AS-PATH

set as-path prepend 65001 65001

set metric {n}

Set MED (Multi-Exit Discriminator)

set metric 100

set origin {igp|egp|incomplete}

Set Origin attribute

set origin igp

bgp bestpath as-path ignore

Ignore AS-PATH length in best path

bgp bestpath as-path ignore

bgp always-compare-med

Compare MED across different ASes

bgp always-compare-med

maximum-paths {n}

Set maximum equal-cost paths

maximum-paths 4

route-map {name} permit {seq}

Create route-map permit entry

route-map FILTER permit 10

route-map {name} deny {seq}

Create route-map deny entry

route-map FILTER deny 20

match ip address prefix-list {name}

Match using prefix list

match ip address prefix-list MY-PREFIXES

match as-path {acl}

Match by AS-PATH

match as-path 10

match community {list}

Match by community

match community COMMUNITY-LIST

neighbor {ip} route-map {name} in

Apply route-map inbound

neighbor 10.0.0.2 route-map FILTER in

neighbor {ip} route-map {name} out

Apply route-map outbound

neighbor 10.0.0.2 route-map FILTER out

ip prefix-list {name} permit {prefix}

Permit prefix

ip prefix-list MY-LIST permit 10.0.0.0/8

ip prefix-list {name} deny {prefix}

Deny prefix

ip prefix-list MY-LIST deny 0.0.0.0/0

ip prefix-list {name} permit {prefix} le {n}

Permit prefix with max length

ip prefix-list MY-LIST permit 10.0.0.0/8 le 24

ip prefix-list {name} permit {prefix} ge {n}

Permit prefix with min length

ip prefix-list MY-LIST permit 0.0.0.0/0 ge 8

ip prefix-list {name} seq {n} permit {prefix}

Permit prefix with sequence number

ip prefix-list MY-LIST seq 10 permit 192.168.0.0/16

neighbor {ip} prefix-list {name} in

Apply prefix list inbound

neighbor 10.0.0.2 prefix-list FILTER in

neighbor {ip} prefix-list {name} out

Apply prefix list outbound

neighbor 10.0.0.2 prefix-list FILTER out

show ip prefix-list {name}

Show prefix list contents

show ip prefix-list MY-LIST

set community {value}

Set community value

set community 65001:100

set community {value} additive

Add to existing communities

set community 65001:200 additive

set community no-export

Set no-export community

set community no-export

set community no-advertise

Set no-advertise community

set community no-advertise

set community local-AS

Set local-AS community

set community local-AS

ip community-list standard {name} permit {val}

Create standard community list

ip community-list standard COMM permit 65001:100

ip bgp-community new-format

Display communities in AA:NN format

ip bgp-community new-format

neighbor {ip} send-community

Send communities to neighbor

neighbor 10.0.0.2 send-community both

show ip bgp summary

Show BGP neighbor summary

show ip bgp summary

show ip bgp

Show BGP table

show ip bgp

show ip bgp neighbors {ip}

Show specific neighbor details

show ip bgp neighbors 10.0.0.2

show ip bgp neighbors {ip} received-routes

Show routes received from neighbor

show ip bgp neighbors 10.0.0.2 received-routes

show ip bgp neighbors {ip} advertised-routes

Show routes advertised to neighbor

show ip bgp neighbors 10.0.0.2 advertised-routes

show ip bgp {prefix}

Show details for specific prefix

show ip bgp 192.168.1.0/24

clear ip bgp *

Reset all BGP sessions

clear ip bgp *

clear ip bgp {ip} soft in

Soft reset inbound policy for neighbor

clear ip bgp 10.0.0.2 soft in

debug ip bgp updates

Enable BGP update debugging

debug ip bgp updates

show ip route bgp

Show BGP learned routes

show ip route bgp

router ospf {id}

Start OSPF process

router ospf 1

network {ip} {wildcard} area {id}

Assign network to OSPF area

network 10.0.0.0 0.0.0.255 area 0

ip ospf cost {n}

Set interface OSPF cost

ip ospf cost 10

area {id} stub

Configure stub area

area 1 stub

area {id} nssa

Configure NSSA area

area 2 nssa

show ip ospf neighbor

Show OSPF neighbors

show ip ospf neighbor

show ip ospf database

Show OSPF database

show ip ospf database

redistribute bgp {ASN} subnets

Redistribute BGP into OSPF

redistribute bgp 65001 subnets

router eigrp {ASN}

Start EIGRP process

router eigrp 100

network {ip} {wildcard}

Configure EIGRP network

network 10.0.0.0 0.0.0.255

no auto-summary

Disable auto-summary

no auto-summary

eigrp router-id {ip}

Set EIGRP router ID

eigrp router-id 1.1.1.1

show ip eigrp neighbors

Show EIGRP neighbors

show ip eigrp neighbors

show ip eigrp topology

Show EIGRP topology table

show ip eigrp topology

redistribute bgp {ASN}

Redistribute BGP into EIGRP

redistribute bgp 65001